Thermodynamic and Exergoeconomic Analysis of a Supercritical CO2 Cycle Integrated with a LiBr-H2O Absorption Heat Pump for Combined Heat and Power Generation

Applied Sciences

Qingya Ma¹  Pan Zhao¹  Yi Yang¹  Zihua Wang¹  Yongquan Lai¹  Yiping Dai¹  Jiangfeng Wang¹ 

[1] School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: supercritical co₂ cycle;    absorption heat pump;    libr-h₂o solution;    parametric study;    optimization;   

DOI  :  10.3390/app10010323

来源: DOAJ

【 摘 要 】

In this paper, a novel combined heat and power (CHP) system is proposed in which the waste heat from a supercritical CO₂ recompression Brayton cycle (sCO₂) is recovered by a LiBr-H₂O absorption heat pump (AHP). Thermodynamic and exergoeconomic models are established on the basis of the mass, energy, and cost balance equations. The proposed sCO₂/LiBr-H₂O AHP system is examined and compared with a stand-alone sCO₂ system, a sCO₂/DH system (sCO₂/direct heating system), and a sCO₂/ammonia-water AHP system from the viewpoints of energy, exergy, and exergoeconomics. Parametric studies are performed to reveal the influences of decision variables on the performances of these systems, and the particle swarm optimization (PSO) algorithm is utilized to optimize the system performances. Results show that the sCO₂/LiBr-H₂O AHP system can obtain an improvement of 13.39% in exergy efficiency and a reduction of 8.66% in total product unit cost compared with the stand-alone sCO₂ system. In addition, the sCO₂/LiBr-H₂O AHP system performs better than sCO₂/DH system and sCO₂/ammonia-water AHP system do, indicating that the LiBr-H₂O AHP is a preferable bottoming cycle for heat production. The detailed parametric analysis, optimization, and comparison results may provide some references in the design and operation of sCO₂/AHP system to save energy consumption and provide considerable economic benefits.

【 授权许可】

Unknown